<% on ||= 1 %>
<div id="nav2">
  <ul>
    <li><a href="/admin/recommend_subjects" <%= is_on?(on, 1) %>>首页主题</a></li>
    <li><a href="/admin/recommend_subjects/new" <%= is_on?(on, 2) %>>添加主题</a></li>
  </ul>
</div>
